| 摘要 |
The invention relates to a method for preparing a nickel superalloy part by: - developing a nickel superalloy from a composition capable of hardening through double precipitation of a gamma' phase and a gamma" or delta phase; - spraying a molten mass of said superalloy to obtain a powder; - sifting said powder; - placing said powder in a container; - closing and placing the container in a vacuum; - densifying the powder and the container to obtain an ingot or billet; - hot forming said ingot or said billet; characterized in that, before the densifying step, the powder and the container are heated for at least 4 hours to a temperature that is both greater than 1,140°C and less than the solidus temperature of the superalloy by 10°C at a pressure causing a densification less than or equal to 15% of the powder volume. The invention also relates to a part thus produced. |
